Use C++11 features in core/html

Source/core/html/HTMLTableSectionElement.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 31 matching lines @@
     : HTMLTablePartElement(tagName, document)
 {
 }
 
 DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(HTMLTableSectionElement)
 
 const StylePropertySet* HTMLTableSectionElement::additionalPresentationAttributeStyle()
 {
     if (HTMLTableElement* table = findParentTable())
         return table->additionalGroupStyle(true);
-    return 0;
+    return nullptr;
 }
 
 // these functions are rather slow, since we need to get the row at
 // the index... but they aren't used during usual HTML parsing anyway
 PassRefPtrWillBeRawPtr<HTMLElement> HTMLTableSectionElement::insertRow(int index, ExceptionState& exceptionState)
 {
     RefPtrWillBeRawPtr<HTMLCollection> children = rows();
     int numRows = children ? static_cast<int>(children->length()) : 0;
     if (index < -1 || index > numRows) {
         exceptionState.throwDOMException(IndexSizeError, "The provided index (" + String::number(index) + " is outside the range [-1, " + String::number(numRows) + "].");
@@ skipping 29 matching lines @@
         ++rowCount;
     return rowCount;
 }
 
 PassRefPtrWillBeRawPtr<HTMLCollection> HTMLTableSectionElement::rows()
 {
     return ensureCachedCollection<HTMLCollection>(TSectionRows);
 }
 
 }